Calculating device



-June 19, 192s. 1,674,157

C. F. CHRISTOPHER` CALCULATING DEVICE Filed March 26, 1925 2Sheets-Sheet l June 19, 1928.

1,674,157 c. F. CHRISTOPHER CALCULATING DEVICE Filed March 26, 192s 2sheets-sheet 2 rE?. 5l f 5 7J' 9 4 2.9 W

Paten-ted June 19, 1928.

UNITED STATES CALVIN F. CHRISTOPHER, OF CANTON, NORTH CAROLINA.

CALGULATING Dnvron.y

i Application filed March 26, 1926. Serial No. 97,617.

This invention aims to provide a novel'and simple device yfor carryingon calculations readily, and to provide novel means for mounting thecalculating mechanism so that it can be noted and operated readily It iswithin the province of the disclosurel tails of construction hereinafterdescribedv and claimed, it vbeing understood that changes in the preciseembodiment of the invention herein disclosed, may be made with in thescope of what is claimed, without departing from the spirit of theinvention.

In the drawings Figure 1 shows in elevation, a device constructed inaccordance with the invention;

Figure 2 is a vertical section;

Figure 3 isa section on the line 3 3 of Figure 1; and

Figures 4 and 5 are fragmental elevations showing certain of thegraduations.

The device forming the subject matter of this application comprises asupport 1 in the form of a plate, having a central hub 2. Carriers 3,likewise in the form of plates, are journaled on the hub 2 and arelocated on opposite sides of the support 1, in contact therewith. Disks4 are secured to the outer surfaces of the carriers 3. Securing devices5, provided with knobs, are mounted on the carriers 3, near to theperiphery thereof. The securing devices 5 carry clips 6. The clips 6hold bezels 7 on the carriers 3. The bezels 7 retain crystals 8. Faceplates 9 are located between the disks 4 and the crystals 8. The faceplates 9 are held by caps 10 and securing elements 11 on the ends of thehubs 2. rlhe face plates 9, therefore, are fixed, whereas the carriers3, the disks 4 and the crystals 8 are rotatable, the knobs 5constituting means whereby the parts specified may be rotated.Indicators 12 are attached to the bezels 7 and overhang the fixed faceplates 9. Each of the fixed face plates 9 has a ring of'numerals 14.Each face plate 9 has a radial line of numeralsl,

indicating whole numbers, and a radial line of fractional markings 16.Radially elongated openings 17 are fashioned in the face plates 9 belowthe numerals shown at 15. The rotatable disks 4 have radial lines ofnumerals 18. These numerals 1S .indicate the price of merchandise inquantities represented by the numbers at 15 on the fixed faceplates 9.The rotatable disks 4 have radial lines of numerals 19. The numerals at19 indicatelthe price of merchandise in fractional quantities designatedby the numerals 16 on the lined face plates 9.

Referring to Figure 1, for example, suppose that the operator is dealingin cloth at ll/c per yard. Then he turns the carriers 3 and the disks 4until the indicator 12 yis on the numeral ll/in the ring 14, as shownyin Figure l.- Thiscauses the numeral 151/2 in vonev yof the radiallines 18 on the disk 4 to appear through the opening 17 in the fixedface plate 9. The operator can now ascertain at a glance, for instance,that nine yards of material at 151/2f: per yard will cost $1.40, and ifhe is dealing in fractional quantities, he can, by referring to thenumerals shown at 16 and 19, ascertain that three-quarters of va yard ofmaterial at ll/Qt per yard will cost 12e. Between the outermost numeralsin the lines 18 (Figure 4) on each disk 4, there are supplementalnumerals shown at 20. The numerals indicated at 15 on the face plate 9run to 10 only but, although the said numerals run to 10, only, theoperator can make computations for 11 yards of cloth, or 12 yards ofcloth, for instance, the numerals shown at 20, (Figure 1) indicating,respectively, that 11 yards of merchandise at 151/2t will oost 17 1, andthat 12 yards at ll/2c will cost On each of the face plates 9 there is atable shown at 21. This table need not be described in det-ail, owinglto its simplicity. It can be seen, however, for instance, that if aperson works four hours at 25, or a quarter of a dollar per hour, thesum of $1.00 will be due him: or that if he works threequarters of a dayat $3.00 per day, the sum of $2.25 will be coming to him.

On each face plate 9 there is inscribed a table shown at 22 and usefulin computations of various kinds, especially in connection with thenumerals shown at 15. Thus` by the use of the table shown at 22, inconjunction with the numerals shown at 15, the operator may find out ata glance that threequarters of an articlewhich costs 9c, will obviously,

call for a payment of 7, orV that/five articles, at a half a centapiece, Will cost three cents. The table 22 has an extension 23 whichgives fractional values of ll andf12.; l

The-field of use for the machine as shovvn can be extended if thesupportl' and parts.

carried thereby is reversed and Ain order to provide for the aforesaidreversal, thes'upport or plate l is supplied at its sides With trunnions24, Vterminating in enlarged heads 25 (Figure 3)', that are ournaledv inoutstandn ing bearings 26'on a frame 27 'having an openingv 28 for thereception of a plate lV and attendant parts, the heads 25 being'held' asshown in upper end of the frame 27,:illurninates those be stood up any-Where. An electric lamp 31 mounted on the' portions of the device bywhich computations are made.

F or the convenience of an operator, a time piece 32 is mounted in thelower portion of the frame 27. V

What is claimed is:-

vl. In a. device of the class described, a carrier, 'a bezel on thecarrier, mechanism for mounting the carrier for rotation; and means forrotating the carrier, said means engaging lthe bezel to hold it on thecarrier.

2. In a jdevice 'of the class described, a carrier, a bezel on thecarrier, mechanism Vfor mountingethe 'carrier for rotation, a securingdevice on the carrier, a clip on the securing device and lengaging thebezel to hold it on thevcarrie'r, and a knob on the securingde;

vice and retaining the clip, the knob constituting `means ivhereby thecarrier may be rotated. v

' In testimony that I claim the foregoing as my own, I have hereto aiXedmy signature. I

CALVIN F. oHRrsToPHER.'

